Worksheet 147 · Skill 5

Set and drift

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1. At 0805 your fix is 066°T, 2.1 nm from Heron Point Light. You steer 347°T at 6.8 kn through the water. At 0845 a new fix puts you 053°T, 4.0 nm from Westfield church spire.

   Plot the 0845 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1455 your fix is 083°T, 2.8 nm from Westfield church spire. You steer 095°T at 4.0 kn through the water. At 1615 a new fix puts you 131°T, 3.1 nm from Tern Island tower.

   Plot the 1615 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 80 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 0730 your fix is 007°T, 2.8 nm from Westfield church spire. You steer 096°T at 5.6 kn through the water. At 0835 a new fix puts you 332°T, 2.2 nm from Tern Island tower.

   Plot the 0835 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 65 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 0925 your fix is 022°T, 2.9 nm from Westfield church spire. You steer 091°T at 4.1 kn through the water. At 1025 a new fix puts you 316°T, 2.2 nm from Tern Island tower.

   Plot the 1025 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 0900 your fix is 125°T, 1.8 nm from Gannet Rock daybeacon. You steer 281°T at 6.0 kn through the water. At 0945 a new fix puts you 227°T, 3.2 nm from Tern Island tower.

   Plot the 0945 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1145 your fix is 049°T, 3.6 nm from Westfield church spire. You steer 158°T at 8.3 kn through the water. At 1220 a new fix puts you 238°T, 3.5 nm from Tern Island tower.

   Plot the 1220 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 0930 your fix is 017°T, 3.2 nm from Westfield church spire. You steer 117°T at 4.0 kn through the water. At 1030 a new fix puts you 275°T, 2.3 nm from Tern Island tower.

   Plot the 1030 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1110 your fix is 069°T, 3.6 nm from Tern Island tower. You steer 223°T at 6.1 kn through the water. At 1200 a new fix puts you 256°T, 3.0 nm from Gannet Rock daybeacon.

   Plot the 1200 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn